Python处理TXT文件完全指南 | Python文本操作教程

# 使用with语句自动管理文件资源
with open('example.txt', 'r', encoding='utf-8') as file:
    content = file.read()
    print(content)
# 文件会在with块结束后自动关闭http:/zhangyutiyu.xinjiangzijiayou.com
http:/zhangyutiyu.mfdgt.com

with open('file.txt', 'r') as f:
    content = f.read()
    print(content)

with open('file.txt', 'r') as f:
    line = f.readline()
    while line:
        print(line.strip())
        line = f.readline()
        http:/zhangyutiyu.wsxzc.com
http:/zhangyutiyu.kstg321.com

with open('file.txt', 'r') as f:
    lines = f.readlines()
    for line in lines:
        print(line.strip())

with open('output.txt', 'w') as f:
    f.write("第一行内容\n")
    f.write("第二行内容\n")
    # 注意：这会覆盖文件原有内容

with open('output.txt', 'a') as f:
    f.write("这是追加的内容\n")
    f.write("更多追加内容\n")
    http:/shanmaozhibo.bcdrying.net

# 高效处理大文件的方法
with open('large_file.txt', 'r', encoding='utf-8') as big_file:
    for line_number, line in enumerate(big_file, 1):
        # 处理每一行
        processed_line = line.strip().upper()
        
        # 每处理10000行输出进度
        if line_number % 10000 == 0:
            print(f"已处理 {line_number} 行")
        
        # 这里可以添加更多的处理逻辑

# 读取文件并做各种处理
with open('data.txt', 'r') as file:
    # 读取所有行并去除换行符
    lines = [line.strip() for line in file.readlines()]
    
    # 过滤空行
    non_empty_lines = [line for line in lines if line]
    
    # 统计行数
    line_count = len(non_empty_lines)
    
    # 将所有内容转为大写
    uppercase_lines = [line.upper() for line in non_empty_lines]
    
    # 查找包含特定关键词的行
    keyword = 'error'
    error_lines = [line for line in non_empty_lines if keyword in line]
    
    # 将处理结果写入新文件
    with open('processed_data.txt', 'w') as output:
        output.write(f"文件共 {line_count} 行内容\n")
        output.write(f"其中包含关键词 '{keyword}' 的行有 {len(error_lines)} 行\n\n")
        output.write("\n".join(uppercase_lines))

import os

file_path = 'important_data.txt'

try:
    # 检查文件是否存在
    if not os.path.exists(file_path):
        raise FileNotFoundError(f"文件 {file_path} 不存在")
    
    # 安全打开文件
    with open(file_path, 'r', encoding='utf-8') as f:
        content = f.read()
        # 处理文件内容...
        
except FileNotFoundError as e:
    print(f"错误：{e}")
except IOError as e:
    print(f"文件读写错误：{e}")
except Exception as e:
    print(f"发生未知错误：{e}")
else:
    print("文件处理成功！")